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FILE COPY <br /> PUBLIC HALTH SERVIS <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISIONi " V! , <br /> i Karen Furst, M.D., M.P.H., Health Officer` <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> P <br /> PAULINE MARQUAND DEC 0 6 2000 <br /> C/O SHAWN KELLEY M & M BUILDERS SUPPLY11 <br /> P O BOX 1107 <br /> TRACY CA 95378-1107 <br /> RE: M & M Builders Supply f SITE CODE: 1530 <br /> 8111 W. Eleventh Street <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has reviewed the "Addendum to M&M Builders Work Plan; Rationale for Groundwater <br /> Definition" dated November 10, 2000 that was submitted by Wright Environmental <br /> Services, Inc. on behalf of the above referenced site and has the following comments. <br /> .V <br /> PHS/EHD requested submittal in writing of a description 6f how vertical definition of the <br /> petroleum hydrocarbon contaminant plume in groundwater would be made at this site. <br /> This request was made as a condition to the approval of the October 16, 2000 work plan <br /> titled "Proposal for Additional Site Groundwater Investigation, and Groundwater > <br /> Monitoring Well Installation". The Addendum states that"Borings will be advanced to <br /> the working aquitard contact so that the aquifer thickness is known". It was previously <br /> stated in the October 16, 2000 work plan that the borings would be advanced to depths <br /> of about 20-25 feet. Prior work at this site included the advancement of five soil borings. <br /> Two of the borings, B-1 and B-2, were advanced to 26 feet below surface grade (bsg); <br /> the remaining three were advanced to 20 feet bsg. The boring log for B-1 labeled the 26 <br /> foot sample as clayey silt with 20% sand. The boring log for B-2 labeled the 26 foot <br /> sample as sandy silt to sandy clay. PHS/EHD is unclear whether this is the depth or <br /> lithologic contact that the Addendum is referring to as thel'working aquitard contact', or if <br /> the Addendum is proposing to extend the borings to a greater depth. Reference is made <br /> in the September 12, 2000 "Proposal for Additional Site Assessment Investigation" to a I <br /> well log for the onsite domestic well, stating that it shows that this well has a sanitary I <br /> seal that crosses clay strata. Is this clay stratum the 'working aquitard contact' that the <br /> Addendum is referring to? And if so, what is its depth? Please clarify in writing to <br /> PHS/EHD what the intended depth of the proposed soil borings is. <br /> i f` <br /> Review of the file for 8181 W. Eleventh Street, the location of the domestic well used by <br /> M & M Builders, indicates that there may actually be two domestic wells at this location. ! <br /> This needs to be verified, and if there are two wells, both should be tested. Total depth <br /> and use of these wells should also be ascertained. Any information that M & M Builders <br /> or Wright Environmental has concerning the onsite wells, including well logs, that could <br /> aid in the investigation of this site should be forwarded to PHS/EHD for review. I <br /> A Division of San Joaquin County Health Care Services <br />